[Ozone-DRI] Adding ScanoutBuffer interface

ui/ozone/platform/dri/scanout_buffer.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_OZONE_PLATFORM_DRI_SCANOUT_BUFFER_H_
+#define UI_OZONE_PLATFORM_DRI_SCANOUT_BUFFER_H_
+
+#include <stdint.h>
+
+#include "base/memory/ref_counted.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace ui {
+
+// Abstraction for a DRM buffer that can be scanned-out of.
+class ScanoutBuffer : public base::RefCounted<ScanoutBuffer> {
+ public:
+  // ID allocated by the KMS API when the buffer is registered (via the handle).
+  virtual uint32_t GetFramebufferId() const = 0;
+
+  // Handle for the buffer. This is received when allocating the buffer.
+  virtual uint32_t GetHandle() const = 0;
+
+  // Size of the buffer.
+  virtual gfx::Size GetSize() const = 0;
+
+ protected:
+  virtual ~ScanoutBuffer() {}
+
+  friend class base::RefCounted<ScanoutBuffer>;
+};
+
+class ScanoutBufferGenerator {
+ public:
+  virtual ~ScanoutBufferGenerator() {}
+
+  virtual scoped_refptr<ScanoutBuffer> Create(const gfx::Size& size) = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRI_SCANOUT_BUFFER_H_